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XANES analysis showing the oxidation state of arsenic associated with a range of Fe(II)-bearing biominerals formed by Fe(III)-reducing bacteria
| Fe biomineral | Composition (%)
|
|
|---|---|---|
| As(V) | As(III) | |
| Vivianite [Fe3(PO4)2 · 8H2O] | 85 | 15 |
| Siderite (FeCO3) | 50 | 50 |
| Magnetite (Fe3O4) | 100 | 0 |
